Add wikipedia-on-this-day widget

widgets/wikipedia-on-this-day/README.md

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+![](preview.png)
+
+# Wikipedia On This Day
+
+Shows notable historical events that happened on today's date, pulled live from Wikipedia's public REST API. No API key required.
+
+The widget fetches Wikipedia's [`feed/onthisday/events/{MM}/{DD}`](https://en.wikipedia.org/api/rest_v1/#/Feed/onThisDay) endpoint using today's date, computed inside the template so the URL stays dynamic without any backend.
+
+## Configuration
+
+No setup needed — the Wikipedia REST API is free and public. If you want a different language edition, change `en` in the URL to another Wikipedia language code (e.g. `de`, `fr`, `ja`).
+
+## Widget
+
+```yaml
+- type: custom-api
+  title: On This Day
+  cache: 6h
+  url: https://api.github.com/rate_limit
+  template: |
+    {{/* Top-level URL is a cheap dummy JSON; the real work is done inside the template via newRequest so we can compute today's date. Wikipedia's REST API requires a descriptive User-Agent per their policy (https://meta.wikimedia.org/wiki/User-Agent_policy) — an unset UA returns 403. */}}
+    {{ $month := now | formatTime "01" }}
+    {{ $day := now | formatTime "02" }}
+    {{ $url := concat "https://en.wikipedia.org/api/rest_v1/feed/onthisday/events/" $month "/" $day }}
+    {{
+      $resp := newRequest $url
+        | withHeader "Accept" "application/json"
+        | withHeader "User-Agent" "glance-dashboard/1.0 (+https://github.com/glanceapp/glance)"
+        | getResponse
+    }}
+
+    {{ if ne $resp.Response.StatusCode 200 }}
+      <p class="color-negative">Failed to load Wikipedia events ({{ $resp.Response.Status }})</p>
+    {{ else }}
+      {{ $events := $resp.JSON.Array "events" }}
+      {{ if eq (len $events) 0 }}
+        <p class="color-subdue">No events found for today.</p>
+      {{ else }}
+        <ul class="list list-gap-14 collapsible-container" data-collapse-after="5">
+          {{ range $events }}
+            {{ $year := .Int "year" }}
+            {{ $text := .String "text" }}
+            {{ $pages := .Array "pages" }}
+            {{ $link := "" }}
+            {{ if gt (len $pages) 0 }}
+              {{ $firstPage := index $pages 0 }}
+              {{ $link = $firstPage.String "content_urls.desktop.page" }}
+            {{ end }}
+            <li>
+              <div class="flex items-baseline" style="gap: 0.6rem;">
+                <span class="color-primary size-h4" style="flex: 0 0 auto; min-width: 3rem;">{{ $year }}</span>
+                <span class="size-h5" style="flex: 1 1 auto;">
+                  {{ if ne $link "" }}
+                    <a href="{{ $link }}" target="_blank" rel="noreferrer" class="color-highlight">{{ $text }}</a>
+                  {{ else }}
+                    {{ $text }}
+                  {{ end }}
+                </span>
+              </div>
+            </li>
+          {{ end }}
+        </ul>
+      {{ end }}
+    {{ end }}
+```
+
+## Variants
+
+### Births
+
+Swap `events` in the `$url` line for `births` to show notable people born today.
+
+```go
+{{ $url := concat "https://en.wikipedia.org/api/rest_v1/feed/onthisday/births/" $month "/" $day }}
+```
+
+### Deaths
+
+```go
+{{ $url := concat "https://en.wikipedia.org/api/rest_v1/feed/onthisday/deaths/" $month "/" $day }}
+```
+
+### All categories combined
+
+The `all` type returns events, births, deaths, holidays, and selected items in one payload. You can iterate `.Array "selected"` or `.Array "events"` etc:
+
+```go
+{{ $url := concat "https://en.wikipedia.org/api/rest_v1/feed/onthisday/all/" $month "/" $day }}
+```
+
+## Notes
+
+- The top-level `url:` field is a dummy cheap Wikipedia call (random page summary). Glance's `custom-api` requires a URL at the top level, but the real work is done inside the template via `newRequest` so the date can be computed dynamically.
+- Cache is set to `6h` — the content rolls over once a day, so anything from 1h to 12h is reasonable.
+- Wikipedia's API is rate-limited to ~200 req/s anonymous. At 6h cache you'll make ~4 requests/day per user — well under the limit.
+- Please set a descriptive `Api-User-Agent` header when using Wikipedia's APIs in production ([per their policy](https://meta.wikimedia.org/wiki/User-Agent_policy)).

widgets/wikipedia-on-this-day/meta.yml

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+title: Wikipedia On This Day
+description: Show notable events, births, and deaths from Wikipedia that happened on today's date in history.
+author: mike-rambil